The Quad 33 is a modular pre-amp which offers a range of different facilities.

In contrast to many modern hifi components, it has a useful range of tone controls. Not only treble and bass boost and cut but also high frequency filters controllable for frequency and slope which are intended to improve the sound of low quality sources.

The rear of the unit. From left to right, the two radio inputs, tape in/out above the preamp output, tape replay input and earth socket, two mains outputs (for matching tuner and the power amp), mains input, fuse and phono input. Note also the flaps which cover the tape and disc adaptor boards.

The preamp doesn't really have enough inputs for modern usage, and the expected signal level is rather low. However, it is very configurable in comparison with modern devices.

The tape adaptor board and the phono adaptor board. Both these boards can be accessed without opening the case. They are pulled out through openings on the back of the preamp.

The screw positions on the tape board allow setting the gain of this input to match other sources.

The disc (phono) adaptor board can be fitted four different ways around. These give two different gains for moving magnet inputs, a ceramic pickup input (of little use these days) and a straight through input with holes left in the PCB for adding your own components. This can be used to convert the disc input for compact disc

Specifications

Frequency response: 30Hz to 20kHz

Total harmonic distortion: 0.02%

Input sensitivity: 2mV (MM), 100mV (ceramic), 100mV (line)

Signal to noise ratio: 70dB (MM), 85dB (line)

Output: 100mV (line), 0.5V (Pre out)

Dimensions: 260 x 92 x 165mm

Weight: 3kg

Note :In Good working Conditionand Still In ORIGINAL Condition, No modification.